Question

A resistance is shown in the figure. Its value and tolerance are given respectively by:

• A. $270\Omega ,5\text{\%}$
• B. $27k\Omega ,10\text{\%}$
• C. $270\Omega ,10\text{\%}$
• D. $27k\Omega ,20\text{\%}$

Answer 1

The correct option is B $27k\Omega ,10\text{\%}$

$\text{Color code}:\begin{array}{cccccccccc}Bl,& Br,& R,& O,& Y,& G,& B,& V,& Gr,& W\\ 0,& 1,& 2,& 3,& 4,& 5,& 6,& 7,& 8,& 9\end{array}$

$\text{R=AB}\times \text{C}\pm \text{D\%}$
where $D=\text{tolerance}$

$D_{\text{gold}}=\pm 5\text{\%},D_{\text{silver}}=\pm 10\text{\%};D_{\text{no colour}}=\pm 20\text{\%}$

Here, the given colour code is
$\text{Red violet orange silver}$

$A=2\to \text{Red}B=7\to \text{Violet}C=3\to \text{orange}D\to \text{silver}$

$\Rightarrow R=27\times {10}^3\Omega \pm 10\text{\%}$

$\Rightarrow R=27k\Omega \pm 10\text{\%}$

Hence, option $\left(B\right)$ is correct.